expose beginUpdates and endUpdates

AsyncDisplayKit/ASCollectionNode+Beta.h

@@ -14,6 +14,8 @@ NS_ASSUME_NONNULL_BEGIN
 @interface ASCollectionNode (Beta)
 
 - (instancetype)initWithFrame:(CGRect)frame collectionViewLayout:(UICollectionViewLayout *)layout layoutFacilitator:(nullable id<ASCollectionViewLayoutFacilitatorProtocol>)layoutFacilitator;
+- (void)beginUpdates;
+- (void)endUpdatesAnimated:(BOOL)animated;
 
 @end
 

AsyncDisplayKit/ASCollectionNode.mm

@@ -187,6 +187,16 @@
   [self.view clearFetchedData];
 }
 
+- (void)beginUpdates
+{
+    [self.view.dataController beginUpdates];
+}
+
+- (void)endUpdatesAnimated:(BOOL)animated
+{
+    [self.view.dataController endUpdatesAnimated:animated completion:nil];
+}
+
 #pragma mark - ASCollectionView Forwards
 
 - (ASRangeTuningParameters)tuningParametersForRangeType:(ASLayoutRangeType)rangeType

AsyncDisplayKit/ASCollectionView.mm

@@ -396,6 +396,11 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
 
 #pragma mark Assertions.
 
+- (ASDataController *)dataController
+{
+    return _dataController;
+}
+
 - (void)performBatchAnimated:(BOOL)animated updates:(void (^)())updates completion:(void (^)(BOOL))completion
 {
   ASDisplayNodeAssertMainThread();

AsyncDisplayKit/Details/ASCollectionInternal.h

@@ -8,11 +8,13 @@
 
 #import "ASCollectionView.h"
 #import "ASCollectionNode.h"
+#import "ASDataController.h"
 #import "ASRangeController.h"
 
 @interface ASCollectionView ()
 - (instancetype)_initWithFrame:(CGRect)frame collectionViewLayout:(UICollectionViewLayout *)layout layoutFacilitator:(id<ASCollectionViewLayoutFacilitatorProtocol>)layoutFacilitator ownedByNode:(BOOL)ownedByNode;
 
+@property (nonatomic, strong, readonly) ASDataController *dataController;
 @property (nonatomic, weak, readwrite) ASCollectionNode *collectionNode;
 @property (nonatomic, strong, readonly) ASRangeController *rangeController;
 @end